Move to your draw step, drawing Approach of the Second Sun and revealing it due to God-Eternal Kefnet's ability.
Resolve God-Eternal Kefnet's trigger, copying Approach of the Second Sun and casting the copy from your hand by paying {4}{W}.
Sunbird's Invocation triggers.
In response, cast Brainstorm by paying {U}.
Sunbird's Invocation triggers again, revealing the top card of your library and putting that card on the bottom of your library.
Resolve Brainstorm, drawing three cards and putting Approach of the Second Sun plus any other card on top of your library.
Resolve the remaining Sunbird's Invocation trigger, revealing the top seven cards of your library, casting Approach of the Second Sun without paying its mana cost, then putting the rest of the revealed cards on the bottom of your library.
Resolve Approach of the Second Sun, putting it back into your library seventh from the top and gaining you 7 life.
Resolve the remaining copy of Approach of the Second Sun.

Win the game

Approach of the Second Sun

Sunbird's Invocation

God-Eternal Kefnet

Brainstorm

Move to your draw step, drawing Approach of the Second Sun and revealing it due to God-Eternal Kefnet's ability.
Resolve God-Eternal Kefnet's trigger, copying Approach of the Second Sun and casting the copy from your hand by paying {4}{W}.
Sunbird's Invocation triggers.
In response, activate Penance by putting Approach of the Second Sun on top of your library, declining to choose a source.
Resolve the Sunbird's Invocation trigger, revealing the top seven cards of your library, casting Approach of the Second Sun without paying its mana cost, then putting the rest of the revealed cards on the bottom of your library.
Resolve Approach of the Second Sun, putting it back into your library seventh from the top and gaining you 7 life.
Resolve the remaining copy of Approach of the Second Sun.

Penance

Move to your draw step, drawing Approach of the Second Sun and revealing it due to God-Eternal Kefnet's ability.
Resolve God-Eternal Kefnet's trigger, copying Approach of the Second Sun and casting the copy from your hand by paying {4}{W}.
Sunbird's Invocation triggers.
In response, activate Brainstone by paying {2}, tapping it, and sacrificing it, drawing three cards and putting Approach of the Second Sun and another card on top of your library.
Resolve the Sunbird's Invocation trigger, revealing the top seven cards of your library, casting Approach of the Second Sun without paying its mana cost, then putting the rest of the revealed cards on the bottom of your library.
Resolve Approach of the Second Sun, putting it back into your library seventh from the top and gaining you 7 life.
Resolve the remaining copy of Approach of the Second Sun.

Brainstone

Move to your draw step, drawing Approach of the Second Sun and revealing it due to God-Eternal Kefnet's ability.
Resolve God-Eternal Kefnet's trigger, copying Approach of the Second Sun and casting the copy from your hand by paying {4}{W}.
Sunbird's Invocation triggers.
In response, activate Hidden Retreat by putting Approach of the Second Sun on top of your library, preventing all damage that would be dealt by the copy of Approach of the Second Sun this turn.
Resolve the Sunbird's Invocation trigger, revealing the top seven cards of your library, casting Approach of the Second Sun without paying its mana cost, then putting the rest of the revealed cards on the bottom of your library.
Resolve Approach of the Second Sun, putting it back into your library seventh from the top and gaining you 7 life.
Resolve the remaining copy of Approach of the Second Sun.

Hidden Retreat

Move to your draw step, drawing Approach of the Second Sun and revealing it due to God-Eternal Kefnet's ability.
Resolve God-Eternal Kefnet's trigger, copying Approach of the Second Sun and casting the copy from your hand by paying {4}{W}.
Sunbird's Invocation triggers.
In response, activate Leashling by putting Approach of the Second Sun on top of your library, returning Leashling to its owner's hand.
Resolve the Sunbird's Invocation trigger, revealing the top seven cards of your library, casting Approach of the Second Sun without paying its mana cost, then putting the rest of the revealed cards on the bottom of your library.
Resolve Approach of the Second Sun, putting it back into your library seventh from the top and gaining you 7 life.
Resolve the remaining copy of Approach of the Second Sun.

Leashling

At the beginning of your upkeep, Survivor of the Unseen's cumulative upkeep ability triggers.
In response, tap Survivor the Unseen to activate it, drawing two cards, revealing Approach of the Second Sun as you draw it, triggering God-Eternal Kefnet, and putting Approach of the Second Sun on top of your library.
Resolve God-Eternal Kefnet's trigger, copying Approach of the Second Sun and casting it by paying {4}{W}.
Sunbird's Invocation triggers, revealing the top seven cards of your library, casting Approach of the Second Sun without paying its mana cost, then putting the rest of the revealed cards on the bottom of your library.
Resolve Approach of the Second Sun, putting it back into your library seventh from the top and gaining you 7 life.
Resolve the remaining copy of Approach of the Second Sun.

Survivor of the Unseen

Move to your draw step, drawing Approach of the Second Sun and revealing it due to God-Eternal Kefnet's ability.
Resolve God-Eternal Kefnet's trigger, copying Approach of the Second Sun and casting the copy from your hand by paying {4}{W}.
Sunbird's Invocation triggers.
Holding priority, activate Conch Horn by paying {1}, tapping it, and sacrificing it, drawing two cards and then putting Approach of the Second Sun on top of your library.
Resolve the Sunbird's Invocation trigger, revealing the top seven cards of your library, casting Approach of the Second Sun without paying its mana cost, then putting the rest of the revealed cards on the bottom of your library.
Resolve Approach of the Second Sun, putting it back into your library seventh from the top and gaining you 7 life.
Resolve the remaining copy of Approach of the Second Sun.

Combos with "Sunbird's Invocation"